hernandez. passenger scott greene watched it happened. >> he had the gun down like this, so i imagine the person that he shot was on the ground already, and he shot twice. >> reporter: billy bey spotted the gunman as he made his way towards the gates. >> i thought he was just a random passenger. very calm, but then as he got closer and turned a bit i saw, you know, the assault rifle strapped on his shoulder and that's when i just high tailed it and ran. >> reporter: so you were surprised. >> that he made it all the way to the gates. >> reporter: that no one stopped him. >> that he wasn't stopped by then, yeah litt. >> reporter: lax police chief says he recently moved armed officers from behind the check point to a more visible location in front. >> are they going to be in the exact same moment, exactly when i want them, when i would hoped they would be, no, it didn't happen in this particular case. >> reporter: officers did swarm the airport after the shooting but witnesses wonder why they weren